End of the
Cold War

Explore how ideological rivalry, economic pressures, and reform movements brought the superpower standoff to a dramatic close between 1985 and 1991.

AP World History

What Was the Cold War?

The Cold War (1947-1991) was a prolonged geopolitical and ideological struggle between two superpowers: the United States and the Soviet Union. Though they never fought each other directly, their rivalry shaped global politics, economics, and culture for nearly half a century.

Capitalism

U.S.-led bloc: free markets, liberal democracy, NATO alliance

Communism

Soviet-led bloc: state-planned economy, one-party rule, Warsaw Pact

Essential Key Terms

Glasnost

"Openness": Gorbachev's policy allowing greater transparency, press freedom, and public debate in the USSR

Perestroika

"Restructuring": economic reforms to decentralize Soviet planning and introduce limited market elements

Détente

Period of eased tensions (1970s) including arms control treaties like SALT I and the Helsinki Accords

Brezhnev Doctrine

Soviet right to intervene in any socialist state threatened by internal or external forces

Solidarity

Polish trade union movement (1980) that became the first independent labor union in a Soviet-bloc country

Why Did It End?

No single cause explains the Cold War's end. Historians point to a convergence of structural pressures and individual agency that made the Soviet system unsustainable by the late 1980s.

1

Economic exhaustion: Soviet GDP growth stalled; military spending consumed roughly 15-25% of GDP, starving civilian sectors.

2

Arms race pressure: Reagan's military buildup and SDI ("Star Wars") forced costly Soviet responses.

3

Gorbachev's reforms: Glasnost and perestroika unintentionally unleashed forces that undermined party control.

4

Nationalist movements: Baltic states, Ukraine, and Central Asian republics demanded sovereignty.

Timeline: 1985-1991

1985

Gorbachev Becomes General Secretary

Launches glasnost and perestroika reform programs

1987

INF Treaty Signed

U.S. and USSR eliminate intermediate-range nuclear missiles

1989

Revolutions Across Eastern Europe

Poland, Hungary, Czechoslovakia, East Germany, Romania overthrow communist regimes

1989

Fall of the Berlin Wall

November 9: East Germany opens its borders; the Wall is torn down

1990

German Reunification

East and West Germany formally reunite on October 3

1991

Dissolution of the USSR

December 25: Gorbachev resigns; Soviet Union officially ceases to exist

Gorbachev's Twin Reforms

The Reagan Factor

U.S. President Ronald Reagan (1981-1989) adopted an aggressive posture toward the Soviet Union, famously calling it an "evil empire." His administration pursued a strategy of peace through strength.

1

Massive military buildup: Defense spending increased by 35% between 1981-1985, straining the Soviet budget to keep pace.

2

Strategic Defense Initiative (SDI): Proposed space-based missile defense system that alarmed Soviet leaders about a potential U.S. first-strike capability.

3

Support for anti-communist movements: Funded resistance in Afghanistan, Nicaragua, Angola, and Poland (Reagan Doctrine).

4

Diplomatic engagement with Gorbachev: Summits at Geneva (1985), Reykjavik (1986), and Washington (1987) led to the INF Treaty.

Containment vs. Rollback

Two competing American strategies shaped Cold War policy. Understanding their distinction is essential for AP essays.

	Containment	Rollback
Goal	Prevent communism from spreading	Actively push back communist influence
Approach	Defensive: alliances, aid, deterrence	Offensive: fund insurgencies, military pressure
Key Era	Truman through Carter (1947-1980)	Reagan era (1981-1989)
Examples	NATO, Marshall Plan, Korean War	SDI, Afghan mujahideen funding, Grenada
Risk Level	Lower: status quo preservation	Higher: potential direct confrontation

The Revolutions of 1989

In a stunning cascade, communist governments across Eastern Europe fell in rapid succession. Gorbachev's refusal to use force (abandoning the Brezhnev Doctrine) was the critical enabler.

The Fall of the Berlin Wall

Dissolution of the USSR

The Soviet Union did not fall in a single moment. Between 1990 and 1991, a series of declarations and crises dismantled the world's largest country from within.

1

Baltic independence: Lithuania (March 1990), Latvia, and Estonia declared sovereignty, challenging Moscow's control.

2

Russian sovereignty: Boris Yeltsin elected president of the Russian Republic (June 1991), creating a rival power center to Gorbachev.

3

August Coup (1991): Communist hardliners attempted to overthrow Gorbachev; Yeltsin rallied resistance, and the coup failed within three days.

4

December 25, 1991: Gorbachev resigned as president; the Soviet flag was lowered over the Kremlin for the last time.

Internal vs. External Causes

AP essays require you to weigh multiple causation. The Cold War ended due to both forces inside and outside the Soviet Union.

	Internal Factors	External Factors
Economy	Command economy stagnation	Arms race spending pressure
Leadership	Gorbachev's reforms backfired	Reagan's confrontational stance
Society	Nationalist movements in republics	Solidarity in Poland inspired others
Ideology	Loss of faith in communist vision	Western cultural influence (media, trade)
Military	Afghan War (1979-1989) drained morale	SDI threat escalated costs

How to Analyze Cold War Causation

Use this framework when writing AP essays on the end of the Cold War:

1

Identify the time period: Specify whether you are discussing long-term causes (1970s détente) or immediate triggers (1989-1991).

2

Categorize causes: Sort into economic, political, social, and ideological. Address both internal (Soviet) and external (U.S./Western) factors.

3

Provide specific evidence: Name treaties (INF, START), events (Berlin Wall, August Coup), and individuals (Gorbachev, Reagan, Yeltsin, Walesa).

4

Evaluate significance: Argue which factor was most important and why, while acknowledging the interplay of multiple causes.

5

Consider historiography: Note that historians debate whether the Cold War ended primarily due to American pressure or Soviet internal collapse.

Example: Economic Collapse

Consider the Soviet economic situation by the late 1980s and how it contributed to the end of the Cold War.

Example: Afghanistan as the Soviet Vietnam

The Soviet-Afghan War (1979-1989) became a quagmire that drained Soviet resources, morale, and international credibility, much as Vietnam had for the United States.

Military Cost

Over 15,000 Soviet soldiers killed; billions in military spending diverted from the struggling economy

Morale Impact

Returning veterans disillusioned; glasnost allowed public criticism of the war for the first time

U.S. Response

CIA funded mujahideen fighters with Stinger missiles, turning the war into a proxy battlefield

Common Mistakes on AP Exams

✕ Single-Cause Explanation

Claiming Reagan "won" the Cold War alone. Strong answers discuss the interplay of U.S. pressure, Soviet internal decay, and Gorbachev's choices.

✕ Confusing Glasnost and Perestroika

Glasnost is political openness; perestroika is economic restructuring. Mixing them up shows weak conceptual understanding.

✕ Ignoring Eastern European Agency

Treating 1989 revolutions as purely a Soviet decision. Solidarity, Vaclav Havel, and mass protests were driven by local populations.

✕ Teleological Thinking

Assuming the Cold War's end was inevitable. In 1985, few predicted the USSR would collapse within six years.

✕ Forgetting the Aftermath

Neglecting post-Cold War consequences: economic shock therapy, ethnic conflicts, NATO expansion, and the rise of new tensions.

Question 1 of 5

Which Soviet leader introduced the policies of glasnost and perestroika?

Mikhail Gorbachev became General Secretary in 1985 and introduced glasnost (openness) and perestroika (restructuring) to modernize the Soviet system. Brezhnev led the era of stagnation; Khrushchev led de-Stalinization; Yeltsin was president of the Russian Republic.

Question 2 of 5

The Berlin Wall fell on November 9 of which year?

The Berlin Wall fell on November 9, 1989, after East German officials mistakenly announced that borders were open immediately. 1990 saw German reunification, and 1991 saw the dissolution of the USSR itself.

Question 3 of 5

Historian A: "The Cold War ended primarily because of relentless American pressure. Reagan's military buildup, the Strategic Defense Initiative, and support for anti-communist movements worldwide exhausted the Soviet Union's resources and forced it to negotiate from a position of weakness."

Historian B: "The Cold War ended because of internal contradictions within the Soviet system. Economic stagnation, nationalist movements, and Gorbachev's own reforms inadvertently destroyed the foundations of communist rule. Western pressure was secondary to these structural failures."

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The point at issue between the two historians is whether:

Historian A emphasizes external American pressure (military buildup, SDI), while Historian B emphasizes internal Soviet weaknesses (economic stagnation, nationalism, reforms). The debate is about which category of causes was primary.

Question 4 of 5

Which event directly triggered the failed August Coup of 1991 against Gorbachev?

Communist hardliners launched the coup to prevent Gorbachev from signing the New Union Treaty, which would have given significant autonomy to Soviet republics. The coup's failure actually accelerated the USSR's dissolution, the opposite of what the plotters intended.

Question 5 of 5

Which of the following best explains why the 1989 revolutions in Eastern Europe were mostly peaceful?

Gorbachev effectively abandoned the Brezhnev Doctrine, signaling that the Soviet military would not intervene to prop up communist governments. Without the threat of Soviet tanks (as in Hungary 1956 or Czechoslovakia 1968), regimes lost their ultimate guarantee of power, and most chose not to fight their own populations.

End of theCold War

What Was the Cold War?

Essential Key Terms

Why Did It End?

Timeline: 1985-1991

Gorbachev's Twin Reforms

The Reagan Factor

Containment vs. Rollback

The Revolutions of 1989

The Fall of the Berlin Wall

Dissolution of the USSR

Internal vs. External Causes

How to Analyze Cold War Causation

Example: Economic Collapse

Example: Afghanistan as the Soviet Vietnam

Common Mistakes on AP Exams

Question 1 of 5

Question 2 of 5

Question 3 of 5

Question 4 of 5

Question 5 of 5

End of the
Cold War